The management of pathogenic bacteria in waterways is a public health issue. Here, we investigated the concentrations of potentially pathogenic bacteria, Arcobacter spp. and Campylobacter spp., and Escherichia coli, by quantifying species-specific genes in surface water samples from canals and the Chao Phraya River from June 2017 to June 2018 in Bangkok, Thailand. We assessed the relationship between the specific bacterial concentrations, water quality, and seasonal changes. Arcobacter spp. were detected at high density in all samples and showed seasonal fluctuations according to analyses based on 16S rDNA and the invasion gene ciaB. High levels of 16S rDNA and dut gene of E. coli were detected in the polluted drainage canals. A high correlation was observed between E. coli and chemical and biochemical oxygen demand (COD and BOD), suggesting that untreated domestic wastewater was the source of the E. coli. In contrast, Arcobacter spp. were detected with high density even in water samples with relatively low COD, suggesting that Arcobacter spp. are more likely than E. coli to survive in the water environment. The analysis of 16S rDNA and ciaB gene sequence analyses indicated that the Arcobacter spp. isolated from the drainage canals were A. butzleri and A. cryaerophilus.

水道中病原菌的管理是一个公共卫生问题。在这里，我们调查了潜在致病菌Arcobacter spp的浓度。和弯曲杆菌属和大肠杆菌，由运河和湄南河六月2017年2018年6月在泰国曼谷量化物种特异性基因地表水样品中。我们评估了特定细菌浓度、水质和季节变化之间的关系。弧菌属 根据基于 16S rDNA 和侵袭基因ciaB 的分析，在所有样品中均检测到高密度，并显示出季节性波动。高水平的 16S rDNA 和dut基因在受污染的排水渠中检测到大肠杆菌。在E之间观察到高度相关性。大肠杆菌和化学和生化需氧量（COD和BOD），这表明未处理的生活废水是源ë。大肠杆菌。相比之下，Arcobacter spp。即使在 COD 相对较低的水样中也能检测到高密度，这表明Arcobacter spp。比大肠杆菌更可能在水环境中存活。16S rDNA 和ciaB基因序列分析表明Arcobacter spp。与引流管隔离的是A. 布茨莱里和A . 嗜冷菌。